Moving materials: Crane and hoist safety

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1 Introduction... 1 Overhead and gantry cranes... 1 Introduction... 1 Crane components... 2 Markings and warnings 3 Loading components... 3 Load handling... 4 Crane inspections... 5 Frequent inspections... 5 Periodic inspections... 6 Rope inspections... 7 Maintenance... 8 Operator training... 9 Glossary of terms for overhead and gantry cranes Crawler, locomotive, and truck cranes Introduction Crane cabs Markings and warnings Traveling Guarding moving parts Lifting personnel Loading/unloading Load ratings Load handling Crane inspections Frequent inspections. 20 Periodic inspections.. 20 Testing Rope inspections Maintenance Operator training Crane operator s basic safety rules Glossary of terms for crawler, locomotive, and truck cranes Derricks Introduction Derrick cabs or operating enclosures. 28 Markings and warnings Guarding moving parts Load handling Derrick inspections Frequent inspections. 30 Periodic inspections.. 30 Rope inspections Maintenance and repairs Glossary of terms for derricks Moving materials: Crane and hoist safety Introduction Moving large, heavy loads is crucial to many manufacturing processes. While forklifts are excellent for moving materials around a facility for stacking, loading, or unloading there are many operations where the best piece of equipment to move heavy or oversized objects is a crane or hoist. A crane is designed to lift and lower a load and move it horizontally. Whether fixed or mobile, cranes are driven manually or by a power source. Cranes come in all sizes, so the task of manipulating materials is made safer and easier. The safe use of a crane depends on several factors, including: Site evaluation Evaluating the terrain, what is around and overhead, what is the load bearing capacity of the site, and what the hazards are in the area. Operator training Operators must be trained in the operation, limitations, and emergency procedures for the cranes they operate. They also need to understand the load ratings and how to safely lift loads. Proper equipment selection for the job Choosing the proper equipment is a factor in operating cranes safely. The crane should be matched to the job. Review the manufacturer s specifications and recommendations to determine if a crane can be used in a particular application. Inspection Inspections ensure that the equipment is functioning correctly. Good maintenance Besides repairing the equipment, a crane program should include preventive maintenance. Well-maintained equipment will aid in preventing accidents involving mechanical failure. Overhead and gantry cranes Introduction Overhead and gantry cranes have a horizontal bridge across which a trolley and hoist travels. A gantry crane has one or more legs running on fixed ground rails, wheels, or other runway systems. Gantry cranes can be portable, with load capacities generally ranging from one to 30 tons, width spanning from eight to 100 feet, and heights from six to 60 feet. These qualities make them ideal for use in warehouses, loading docks, and vehicle maintenance facilities. This type of crane, having trolleys and similar travel characteristics, also include semigantry, cantilever gantry, wall cranes, and storage bridge cranes. Materials being moved by these cranes are attached to a hoisting mechanism on the trolley. These cranes are useful in general machine shops, fabricating assemblies, printing operations, and warehousing. They can be purchased as is or custom-built by the manufacturer. A variation, the jib crane, is useful for moving smaller, localized loads. OSHA s general requirements OSHA s Overhead and Gantry Crane rule, , requires that cranes constructed after August 31, 1971 have to meet the design specifications of the ANSI/ASME standard Safety Code for Overhead and Gantry Cranes, ANSI B The most recent revision of this standard is the 2001 edition. The OSHA rule covers the safe operation of overhead- and gantry-type cranes by setting down manufacturer s design criteria, as well as the safe procedures employers must follow pertaining to crane and rope inspections, equipment maintenance, load handling, and operator training. The following information summarizes the OSHA requirements, as well as safety points from the ANSI B30.2 standard and from crane manufacturers and users. For details, you should obtain a copy of the rule and/or the consensus standard, and the crane manufacturer s operational manual. 1

2 Crane components Cabs The general arrangement of the cab and the location of control and protective equipment must be such that all operating handles are within the operator s convenient reach when facing the area to be served by the load hook, or while facing the direction of travel of the cab. The arrangement needs to allow the operator a full view of the load hook in all positions. If there are positions where the view is blocked, other methods such as closed-circuit television, mirrors, radio, or a signal person may be used. The cab needs to have sufficient light, either natural or artificial, so that the operator can see clearly. A portable fire extinguisher with a basic minimum rating of 10 BC must be kept in or near the cab area. Carbon tetrachloride fire extinguishers are prohibited in crane cabs. There should be an emergency exit method, such as two exits remote from each other, in cab-operated cranes. The crane should have a fixed ladder, stairs, or platform allowing access to the cab and/or bridge walkway. If sufficient headroom is available on cab-operated cranes, there will be a service platform (footwalk) with an antislip surface on the drive side along the entire length of the bridge. Personal items must be stored safely so they won t interfere with crane operation. Items related to operations such as tools, oil cans, waste, extra fuses, and other necessary articles must be stored in the tool box and not permitted to lie loose in the cab. Bumpers and brakes The bumper, which is attached to the bridge, trolley, or runway stop, reduces the force of impact when a moving crane reaches the end of its permitted travel distance. Cranes and trolleys, with few exceptions, must have bumpers or other automatic means to stop the bridge when traveling in either direction with power off at a speed of at least 40 percent of the rated load speed. The bumper has to be designed and installed to minimize parts falling from the crane or trolley in case of breakage. When more than one trolley is operated on the same bridge, each must be equipped with bumpers or equivalents. Rail sweeps Crane bridges must be equipped with rail sweeps to clear the travel path. The rail sweep, a device located in front of the crane s leading wheels, removes obstructions from the runway. If obstructions are not removed, they could damage the wheel or cause it to derail. Guards All exposed moving parts such as gears, set screws, projecting keys, chains, chain sprockets, and reciprocating components, which might constitute a hazard under normal operating conditions, must be guarded. The guard must be capable of supporting (without permanent distortion) the weight of a 200- pound person unless the guard is located where it is impossible for someone to step on it. Hoisting ropes that run too close to other parts need to be guarded. Also, to prevent contact between bridge conductors and hoisting ropes, a guard may be needed. Brakes Brakes for trolleys and bridges may be applied by mechanical, electrical, pneumatic, hydraulic, or gravity methods. Foot-brake pedals must have a non-slip surface and automatically release when the operator releases pressure from the pedal. Each independent hoisting unit needs to be equipped with at least one self-setting holding brake, and with the exception of worm-geared hoists, a braking method to control the load during lowering and prevent overspeeding. Holding brakes on hoists must be applied automatically when power is removed. Electrical equipment Electrical equipment must be located or enclosed so that live parts will not be exposed to accidental contact under normal operating conditions. Clearly marked control boxes must be installed to prevent electrical shock and display warnings such as Lockout disconnecting means before removing cover or servicing equipment or Do not operate without cover in place. Protect electrical equipment from dirt, grease, oil, and moisture. The controls for the bridge and trolley travel must be located so that the operator can generally face the direction of travel and be within easy reach. Controls must automatically return to the off position when released by the operator and all master switches have to be appropriately labeled. If a service receptacle is provided in the cab or on the bridge of cab-operated cranes, it has to be a grounded three-prong type permanent receptacle, not exceeding 300 volts. 2

3 Markings and warnings The rated load of the crane must be plainly marked on each side. If the crane has more than one hoisting unit, the rated load will be marked on each hoist or its load block. The markings have to be large enough so they are clearly legible from the ground level. The rated load marking must contain at least the following information: Name and address of the manufacturer; Manufacturer s model or serial number; and Voltage of AC or DC power supply and phase and frequency of AC power supply. Floor- and remote-operated cranes Floor-operated and remote-operated cranes must have safety labels that include precautionary warnings such as: Do not lift more than the crane s rated load; Do not operate the hoist with kinked or damaged chain or rope; and Never lift loads over pedestrians. Cab-operated cranes Cab-operated cranes must also have safety labels that caution against operations such as: Operating the hoist when the load is not centered; Lifting personnel; and Operating a rope hoist when the rope is not properly seated in the groove. Manufacturer s precautions Most manufacturers prepare warning labels for their equipment. If the labels and other markings are not on the crane, they may be shipped with it and the purchaser will be instructed to apply the labels when the equipment is assembled. A manufacturer s warning labels may include statements such as Caution: Lock wheels when in use or Caution: Do not move gantry while loaded. If warning labels are missing, contact the manufacturer for replacements. Loading components Proper loading is essential to crane safety. Never use a crane and/or its accessories to lift more than their rated load capacity. A crane s load rate capacity is based on new equipment. When rating a load to be lifted, consider the age of the crane and daily wear, both of which reduce the operating capacity of the crane. Never use two pieces of equipment to lift a load greater than the rated capacity of a single piece of equipment. If a gantry crane is used with an electric hoist or other electrical accessories, make sure the electrical ground wires are installed according to the National Electrical Code and all wires are connected when the equipment is used. You may want to consult your local electrical code for requirements concerning connecting and operating electrical equipment. According to OSHA, the minimum clearance for obstructions must be three inches overhead and two inches laterally between the crane and all obstructions. Running sheaves Maintain sheave grooves on hoisting equipment so they are smooth and free from surface defects which could cause rope damage. All running sheaves must be lubricated. Permanently lubricated, sealed and/or shielded bearings meet this requirement. Ropes Follow the crane manufacturer s recommendation when using hoisting ropes. The rated load, divided by the number of parts of rope, may not exceed 20 percent of the nominal breaking strength of the rope. 3

4 Rope must be secured to the drum with no less than two wraps of rope remaining on the drum when the hook is in its extreme low position. The rope end has to be anchored by a clamp securely attached to the drum, or by a socket arrangement approved by the crane or rope manufacturer. Replacement rope should be the same size, grade, and construction as the original rope, unless otherwise recommended by a wire rope manufacturer, due to actual working condition requirements. If a load is supported by more than one part of rope, the tension in the parts must be equalized. Hooks Hooks must meet the manufacturer s recommendations and not be overloaded. Swivel- type hooks should rotate freely. Warning alarms Except for floor-operated cranes, a manually-operated gong; power-operated bell, siren, or horn; rotating beacon; or strobe light must be used for each crane equipped with a power traveling mechanism. Outdoor storage bridges need to have a wind-indicating device which gives a visible or audible alarm to the bridge operator at a predetermined wind velocity. Load handling Never load a crane beyond its rated capacity. When attaching the load, be sure the hoist chain or hoist rope is free from kinks or twists and does not wrap around the load. The load should be moved from one point to another by moving the trolley back and forth along the bridge, while the crane itself is stationary. When moving the load, be sure that it is well secured and properly balanced before it is lifted more than a few inches. Before starting to hoist, inspect for the following conditions: Hoist rope is not kinked. Multiple-part lines are not twisted around each other. The hook is positioned above the center of gravity of the load in such a way as to minimize swinging when the load is lifted. If there is a slack-rope condition, be sure that the rope is properly seated on the drum and in the sheaves. All personnel, including the qualified rigger, must be clear of the load. The only purpose of the hoist is to move the load straight up and down and to suspend the load. Do not operate the hoist to move in any direction other than straight up and down. During hoisting, ensure that: The load is lifted slowly until it clears the ground or other support to minimize swinging. There is no sudden acceleration or deceleration of the moving load. The load does not contact any obstructions. Conduct a dry run in areas where clearance is limited. Loading precautions While any employee is on the load or hook, do not allow hoisting, lowering, or traveling. The operator should never carry loads over people nor leave the control position while the load is suspended. When starting the bridge and when the load or hook approaches near or over personnel, the warning signal must be sounded. The operator must test the brakes each time a load approaching the rated load is handled. Test the brakes by raising the load a few inches and applying the brakes. Do not lower the load below the point where less than two full wraps of rope remain on the hoisting drum. 4

5 When two or more cranes are used to lift a load, one qualified responsible person must be in charge of the operation. This person will analyze the operation and instruct all personnel involved in the proper positioning, rigging of the load, and the movements to be made. Pre-start-up testing At the beginning of each operator s shift, test the upper limit switch of each hoist under no load conditions. Practice extreme care the block should be inched into the limit or run in at slow speed. If the switch does not operate properly, immediately notify the appropriate person. Never use the hoist limit switch, which controls the upper limit of travel of the load block, as an operating control. Crane inspections Initial inspection All new and altered cranes must be inspected prior to initial use. Inspection procedures for cranes in regular service are divided into two general classifications, based on the intervals at which inspection should be performed. The intervals frequent and periodic depend on the nature of the crane s critical components and the degree of their exposure to wear, deterioration, or malfunction. Frequent inspection daily to monthly intervals. Periodic inspection one to 12 month intervals. In-service inspection criteria The Department of Energy s Hoisting and Rigging Standard DOE-STD defines crane service as: Normal service operating at less than 85 percent of rated load and not more than 10 lift cycles/hr. except for isolated instances. Heavy service operating at 85 to 100 percent of rated load or in excess of 10 lift cycles/hr. as a regular specified procedure. Severe service operating at normal or heavy service under abnormal operating conditions (i.e., extreme temperatures or corrosive atmospheres). Inspections should be based on the following criteria: Normal service monthly Heavy service weekly to monthly Severe service daily to weekly Period inspections: Normal service yearly Heavy service semi annually Severe service quarterly Frequent inspections The following items must be inspected for defects in the frequent range, or as specifically indicated, including observation during operation for any defects which might appear between regular inspections. Carefully examine all deficiencies, including the following, and decide if they constitute a safety hazard. Daily All controls and operating mechanisms for proper operation. Deterioration or leakage in lines, tanks, valves, drain pumps, and other parts of air or hydraulic systems. Visual inspection daily 5

6 Monthly inspection with documentation Hooks with deformation or cracks. Written certification must include the date of inspection; the signature of the person who performed the inspection; and the serial number, or other identifier of the hook inspected. Note: For hooks with cracks or having more than 15 percent in excess of normal throat opening or more than 10º twist from the plane of the unbent hook, refer to (l)(3)(iii)(a). Hoist chains, including end connections, for excessive wear, twisted, distorted links interfering with proper function, or stretched beyond manufacturer s recommendations. Written certification must include the date of inspection, the signature of the person who performed the inspection, and an identifier of the chain which was inspected. All functional operating mechanisms for excessive wear of components. Rope reeving for noncompliance with manufacturer s recommendations. Periodic inspections The following items must be inspected for defects in the periodic range, depending on the crane s activity, severity of service, and environment. Periodic is defined as one to 12 month intervals. These inspections are in addition to those required by the frequent section. Any listed deficiencies must be carefully examined as to whether they constitute a safety hazard. Deformed, cracked, or corroded members. Loose bolts or rivets. Cracked or worn sheaves and drums. Worn, cracked or distorted parts such as pins, bearings, shafts, gears, rollers, locking and clamping devices. Excessive wear on brake system parts, linings, pawls, and ratchets. Load, wind, and other indicators over their full range, for any significant inaccuracies. Gasoline, diesel, electric, or other power plants for improper performance or noncompliance with applicable safety requirements. Excessive wear of chain drive sprockets and excessive chain stretch. Electrical apparatus, for signs of pitting or any deterioration of controller contactors, limit switches and push button stations. Cranes not in regular use One through five months A crane which has been idle for one or more months, but less than six months, due to shutdown or storage, must have a frequent inspection plus a rope inspection before it can be put in service. Appoint someone to inspect the rope for all types of deterioration. This person must approve and verify the condition of the rope prior to use by a certification that includes the date of inspection, the signature of the person who performed the inspection, and an identifier for the rope which was inspected. Over six months A crane which has been idle for over six months must be given a complete inspection covering the requirements for both frequent and periodic inspections plus a rope inspection before it can be put in service. 6

7 Appoint someone to inspect the rope for all types of deterioration. This person must approve and verify the condition of the rope prior to use by a certification that includes the date of inspection, the signature of the person who performed the inspection, and an identifier for the rope which was inspected. Standby cranes Standby cranes must be inspected at least semi-annually. The crane must have a frequent inspection plus a rope inspection before it can be put in service. Appoint someone to inspect the rope for all types of deterioration. This person must approve and verify the condition of the rope prior to use by a certification that includes the date of inspection, the signature of the person who performed the inspection, and an identifier for the rope which was inspected. Operational tests Prior to initial use, all new, reinstalled, repaired, or modified cranes must be tested by a designated person on the following functions: Hoisting and lowering, Trolley travel, Bridge travel, and Limit switches, locking, and safety devices. Determine the trip setting of hoist switches by tests with an empty hook traveling in increasing speeds up to the maximum speed. The actuating mechanism of the limit switch must be located so that it will trip the switch, under all conditions, in sufficient time to prevent contact of the hook or hook block with any part of the trolley. Test loads may not be more than 125 percent of the rated load unless otherwise recommended by the manufacturer. Maintain the test reports on file where readily available to appointed personnel. Rope inspections Running ropes A thorough inspection of all ropes must be made at least once a month. A certification record which includes the date of inspection, the signature of the person who performed the inspection, and an identifier for the ropes which were inspected must be kept on file where readily available to appointed personnel. Any deterioration that results in appreciable loss of original strength must be carefully observed and determination made as to whether further use of the rope would constitute a safety hazard. Some of the conditions that could result in an appreciable loss of strength include: Reduction of rope diameter below nominal diameter due to loss of core support, internal or external corrosion, or wear of outside wires; A number of broken outside wires and the degree of distribution or concentration of such broken wires; Worn outside wires; Corroded or broken wires at end connections; Corroded, cracked, bent, worn, or improperly applied end connections; and Severe kinking, crushing, cutting, or unstranding. When an inspection determines that the rope has met one of the removal criteria, it must be replaced. Based on the judgment of a qualified person, it may be replaced at the end of a workshift, end of the work day, or prior to it being used again. 7

8 Other ropes All rope which has been idle for a month or more due to crane shutdown or storage must be given a thorough inspection before it is used. Inspect for all types of deterioration. The inspection will be performed by an appointed person whose approval is required before the rope may be used. A record certifying the inspection must be available which includes the date of inspection, the signature of the person who performed the inspection, and an identifier for the rope which was inspected. Maintenance Keeping a crane in good operating condition requires preventive maintenance as well as timely repairs. Establish a preventive maintenance program based on the crane manufacturer s recommendations. A qualified person can be helpful in setting up this program. Be sure to record maintenance procedures, the date, and file them for future reference. Retain your maintenance history throughout the life cycle of the crane. Your maintenance program should also include a lockout/tagout policy and procedures for worker safety when work is being done on a crane. What is considered a normal operating condition? Whenever a crane is used in its regular production activities such as materials handling and loading, and is under the control of its operator rather than under the control of a maintenance worker, it is considered to be used in a normal operating condition. However, normal operating conditions do not cover when a crane is taken out of production for maintenance work and is under the control of the maintenance person. Routine maintenance procedures Prior to maintenance work Before adjustments and repairs are started on a crane, take the following lockout precautions: Move the crane to be repaired to a location where it will cause the least interference with other cranes and operations in the area. Place all controllers in the off position. Open and lock the emergency switch (or main switch) in the open position. Place Warning or Out of order signs on the crane, and also on the floor beneath or on the hook where visible from the floor. Where other cranes are in operation on the same runway, provide rail stops or other suitable methods to prevent interference with the idle crane. Following maintenance work After adjustments and repairs have been made, do not operate the crane until all guards have been reinstalled, safety devices reactivated, and maintenance equipment removed. Adjustments and repairs Any unsafe conditions discovered during the inspection must be corrected before crane operation is resumed. Adjustments and repairs may be done only by designated personnel. Adjustments Examples of adjustments that must be maintained to assure correct functioning of crane components include: All functional operating mechanisms, Limit switches, Control systems, Brakes, and 8

9 Power plants. Repairs For safe operation, make all repairs or replacements promptly. Include the following crane components in the repair process: Defective crane hooks. Generally, do not attempt to repair crane hooks by welding or reshaping. The best procedure is to discard defective hooks. If repairs are attempted, they may only be done under competent supervision. Following a repair, test the hook according to the load requirements of not more than 125 percent of the rated load, unless otherwise recommended by the manufacturer before further use. Load attachment chains and rope slings showing defects, including hoist chains and end connections, for excessive wear, twist, distorted links interfering with proper function, or stretch beyond manufacturer s recommendations. All critical parts which are cracked, broken, bent, or excessively worn. Pendant control stations need to be kept clean and function labels kept legible. Lubrication Follow the manufacturer s recommendation for routinely lubricating the crane s moving parts. The manufacturer will recommend the points of lubrication, frequency, and the type of lubricant to use. Unless equipped for automatic lubrication, cranes must be stationary when lubricants are applied. Operator training OSHA requires that only thoroughly trained and competent personnel be permitted to operate overhead and gantry cranes. It also requires that operators and maintenance personnel are familiar with the operation and care of fire extinguishers provided in the cab. For safety sake, train employees who are using ladders to avoid carrying objects that could cause them to loose their grip on the ladder. Articles that are too large to be carried in pockets or belts should be lifted and lowered by hand line. ASME B30.2 physical criteria The ASME B30.2 Safety Code for Overhead and Gantry Cranes contains specific criteria for operators physical fitness as well as training criteria. It requires that potential operators pass a written or oral exam and practical operating examination. Some additional physical criteria includes: The ability to distinguish colors and to hear with or without a hearing aid; To have strength, endurance, agility, coordination, and reaction speed to meet the rigors of crane operation; and To have normal depth perception and vision field. A potential operator may be disqualified based on certain physical conditions. For a complete list of physical requirements, see the B30.2 standard. Operational requirements Workers who are physically capable of performing the job must, among other things, understand hand signals and the appropriate responses; be responsible for their lifts; activate warning devices when necessary; know procedures to take when leaving the cab; understand their equipment and its care; and obey stop signals, no matter who gives them. Be sure training covers: Handling the load; Attaching the load; Moving the load; 9

10 Hoist-limit devices; and Hand and special signals. Manufacturer s guidelines The crane manufacturer is required to furnish a user s manual containing general and specific operating instructions and information about installation, inspection, testing, lubrication, and maintenance of the crane. Employees with crane responsibilities should be familiar with the information in the manual. Crane operator training tips To reduce the chance of an injury, include training on the following precautions: 1. Require workers to always check the crane s load chart to ensure that the crane will not be overloaded by operating conditions. 2. Instruct workers to plan lifts before starting them to ensure that they are safe. 3. Tell workers to take additional precautions and exercise extra care when operating around power lines. 4. Direct workers to always keep hoisting chains and ropes free of kinks or twists and never wrapped around a load. 5. Train workers to attach loads to the load hook by slings, fixtures, and other devices that have the capacity to support the load on the hook. 6. Instruct workers to pad sharp edges of loads to prevent cutting slings. 7. Teach workers to maintain proper sling angles so that slings are not loaded in excess of their capacity. Glossary of terms for overhead and gantry cranes A crane is a machine for lifting and lowering a load and moving it horizontally, with the hoisting mechanism an integral part of the machine. Cranes whether fixed or mobile are driven manually or by power. An automatic crane is a crane which when activated operates through a preset cycle or cycles. A cab operated crane is a crane controlled by an operator in a cab located on the bridge or trolley. Cantilever gantry crane means a gantry or semigantry crane in which the bridge girders or trusses extend transversely beyond the crane runway on one or both sides. Floor operated crane means a crane which is pendant or nonconductive rope controlled by an operator on the floor or an independent platform. Gantry crane means a crane similar to an overhead crane except that the bridge for carrying the trolley or trolleys is rigidly supported on two or more legs running on fixed rails or other runway. Hot metal handling crane means an overhead crane used for transporting or pouring molten material. Overhead crane means a crane with a movable bridge carrying a movable or fixed hoisting mechanism and traveling on an overhead fixed runway structure. Power operated crane means a crane whose mechanism is driven by electric, air, hydraulic, or internal combustion means. 10

11 A pulpit operated crane is a crane operated from a fixed operator station not attached to the crane. A remote operated crane is a crane controlled by an operator not in a pulpit or in the cab attached to the crane, by any method other than pendant or rope control. A semigantry crane is a gantry crane with one end of the bridge rigidly supported on one or more legs that run on a fixed rail or runway, the other end of the bridge being supported by a truck running on an elevated rail or runway. Storage bridge crane means a gantry type crane of long span usually used for bulk storage of material; the bridge girders or trusses are rigidly or nonrigidly supported on one or more legs. It may have one or more fixed or hinged cantilever ends. Wall crane means a crane having a jib with or without trolley and supported from a side wall or line of columns of a building. It is a traveling type and operates on a runway attached to the side wall or columns. An auxiliary hoist is a supplemental hoisting unit of lighter capacity and usually higher speed than provided for the main hoist. A brake is a device used for retarding or stopping motion by friction or power means. A drag brake is a brake which provides retarding force without external control. A holding brake is a brake that automatically prevents motion when power is off. Bridge means that part of a crane consisting of girders, trucks, end ties, footwalks, and drive mechanism which carries the trolley or trolleys. Bridge travel means the crane movement in a direction parallel to the crane runway. A bumper (buffer) is an energy absorbing device for reducing impact when a moving crane or trolley reaches the end of its permitted travel; or when two moving cranes or trolleys come in contact. The cab is the operator s compartment on a crane. Conductors, bridge are the electrical conductors located along the bridge structure of a crane to provide power to the trolley. Conductors, runway (main) are the electrical conductors located along a crane runway to provide power to the crane. The control braking means is a method of controlling crane motor speed when in an overhauling condition. Countertorque means a method of control by which the power to the motor is reversed to develop torque in the opposite direction. Dynamic means a method of controlling crane motor speeds when in the overhauling condition to provide a retarding force. Regenerative means a form of dynamic braking in which the electrical energy generated is fed back into the power system. Mechanical means a method of control by friction. Controller, spring return means a controller which when released will return automatically to a neutral position. 11

12 Designated means selected or assigned by the employer or the employer s representative as being qualified to perform specific duties. A drift point means a point on a travel motion controller which releases the brake while the motor is not energized. This allows for coasting before the brake is set. The drum is the cylindrical member around which the ropes are wound for raising or lowering the load. An equalizer is a device which compensates for unequal length or stretch of a rope. Fail safe means a provision designed to automatically stop or safely control any motion in which a malfunction occurs. Footwalk means the walkway with handrail, attached to the bridge or trolley for access purposes. A hoist is an apparatus which may be a part of a crane, exerting a force for lifting or lowering. Hoist chain means the load bearing chain in a hoist. Hoist motion means that motion of a crane which raises and lowers a load. Load means the total superimposed weight on the load block or hook. The load block is the assembly of hook or shackle, swivel, bearing, sheaves, pins, and frame suspended by the hoisting rope. Main hoist means the hoist mechanism provided for lifting the maximum rated load. A man trolley is a trolley having an operator s cab attached thereto. Rated load means the maximum load for which a crane or individual hoist is designed and built by the manufacturer and shown on the equipment nameplate(s). Rope refers to wire rope, unless otherwise specified. Running sheave means a sheave which rotates as the load block is raised or lowered. 12

13 Crawler, locomotive, and truck cranes Introduction Crawler cranes, locomotive cranes, both truck and self-propelled wheel-mounted cranes, and any variations which have the same basic characteristics are covered by OSHA s crane standard. These types of cranes are powered by internal combustion engines or electric motors and utilize drums and ropes. Simple definitions of these cranes follow. Crawler crane A crawler crane consists of a rotating superstructure with power plant, operating machinery, and boom, mounted on a base, equipped with crawler treads for travel. Its function is to hoist, swing, and lower loads at various radii. Locomotive crane A locomotive crane consists of a rotating superstructure with power plant, operating machinery and boom, mounted on a base or car equipped for travel on railroad track. It may be self-propelled or propelled by an outside source. Its function is to hoist, swing, and lower loads at various radii. Truck crane A truck crane consists of a rotating superstructure with power plant, operating machinery and boom, one or more operator s stations mounted on an automotive truck equipped with a power plant for travel. Its function is to hoist, swing, and lower loads at various radii. Wheel-mounted crane A wheel-mounted crane (wagon crane) consists of a rotating superstructure with power plant, operating machinery, boom, and operator s station mounted on a base or platform equipped with axles and rubber-tired wheels for travel. The base is usually propelled by the engine in the superstructure, but it may be equipped with a separate engine controlled from the superstructure. Its function is to hoist, swing, and lower loads at various radii. Only machines used as lifting cranes are covered by both the OSHA standard and the ASME B30.5 standard for mobile and locomotive cranes. Neither standard applies to cranes designed for railway and automobile wreck clearances. OSHA s general requirements OSHA regulations require that all crawler, locomotive, and truck cranes constructed after August 31, 1971 have to meet the design specifications of the ANSI/ASME B , Safety Code for Crawler, Locomotive, and Truck Cranes. The most recent revision of the ASME standard is the 2000 edition. The OSHA rule covers the safe operation of crawler, locomotive, and truck type cranes by setting down the safe procedures employers must follow pertaining to crane and rope inspections, equipment testing and maintenance, load handling, and operator training. The following information summarizes the OSHA requirements, as well as safety points from the ANSI B30.5 standard and from crane manufacturers and users. For details, you should obtain a copy of the rule and/or the consensus standard, and the crane manufacturer s operational manual. Crane cabs Crane cabs have windows on the front and sides for easy viewing. The front window should have a windshield wiper to ensure the operator s visibility. The cab door adjacent to the operator either swings outward or slides to the rear for easy exit. If the cab has a platform, the platform will have a guardrail or handholds and a slip-resistant walking surface. Single-control station wheel-mounted cranes are required to be equipped with seat belts for use during travel. Cab controls The basic controls for operating the crane are located within the operator s easy reach. Remote-operated cranes have an emergency stop in case there is a malfunction. Controls include the means to start and stop the equipment, control engine speed, emergency stop, and select transmissions. 13

14 Cab storage The crane operator s extra clothing and personal belongings have to be stored so that they won t interfere with the crane s operation. Store tools, oil cans, waste, extra fuses, and other necessary articles in the toolbox which is attached directly to the crane. Items lying loose in or about the cab create a safety hazard. Fire extinguishers A carbon dioxide, dry chemical, or equivalent fire extinguisher must be kept in the cab or vicinity of the crane. Crane operators and maintenance personnel need to be trained in the use and care of the fire extinguishers. Fueling Refueling with small portable containers may be done using an approved safety can equipped with an automatic closing cap and flame arrester. Never refuel when the engine is running. Never allow smoking or open flames in a refueling area. The fuel tank filler pipe should be protected to prevent fuel from spilling or overflowing onto the engine, exhaust, or electrical equipment. Engine exhaust gases must be pumped to the outside and away from the operator. For safety, exhaust pipes need to be guarded or insulated to prevent contact. Markings and warnings Load rating chart A substantial and durable rating chart with clearly legible letters and figures must be provided by the manufacturer with each crane. The chart needs to be securely fixed to the crane cab in a location easily visible to the operator while seated at the control station. The rated load of the crane must be plainly marked on each side. If the crane has more than one hoisting unit, the rated load will be marked on each hoist or its load block. The markings have to be large enough so they are clearly legible from the ground level. The rated load marking must contain at least the following information: Crane load ratings at all operating radii, boom angles, work areas, jib lengths, and alternate ratings for optional equipment; Work area chart for specific listed capacities; Limitations such as structural or hydraulic; Areas where no load is to be handled; and Recommended reeving for hoist lines. In addition, the following information, where applicable for a particular crane, must be included either on the rating chart or in the user s manual: Recommended parts of hoist reeving, size and type of rope; Boom hoist reeving diagram; Tire pressure; Precautions for equipment and operating limitations; Gantry positioning and boom suspension; Instructions for boom erection, boom/jib raising and lowering; Specific hoist-holding mechanism details; Specific details regarding telescopic booms; and 14

15 Hydraulic relief valve settings. Audible warning All cranes have to be equipped with an audible signal device that is controlled by the operator. Audible travel signals that an operator may use equate to: One blast = stop, Two blasts = go ahead, and Three blasts = back up. Communication Crane operators may use standard hand signals to communicate during operations, unless reliable voice equipment such as telephones, radios, or similar equipment is used. Electrical warning A sign warning about electrocution or serious injury has to be installed in a location clearly visible from the operator s station. The sign will specify that a minimum clearance of 10 feet must be maintained between the crane or load and energized power lines up to 50 kv, and that greater clearances are required for higher voltages. Traveling On all single-control station cranes, the travel controls are located in the operator s station. Wheelmounted multiple control station cranes will have these controls located in the carrier cab. When an operator is in a traveling crane, communication between cabs is required. Guarding moving parts Moving parts on cranes are usually guarded when the equipment is manufactured. Employers must ensure that guards cover all moving parts which may present a hazard and remain in place, such as on gears, set screws, projecting keys, chains and sprockets, and reciprocating or rotating parts. Protect dry friction brakes and clutches against rain and other liquids such as oil and lubricants. Further, provide protection for hydraulic and pneumatic lines as practical. Lifting personnel OSHA s (h)(3)(v) covers the use of suspended personnel platforms in general industry. The standard prohibits hoisting, lowering, swinging, or traveling while anyone is on the load or hook. When the use of a conventional means of access to any elevated worksite would be impossible or more hazardous, however, OSHA will treat a violation of (h)(3)(v) as de minimis in effect, disregarded if the employer has complied with the provisions in the construction industry regulations at (g)(3-8). Because using cranes or derricks to hoist personnel poses a serious risk to the employees being lifted, any cranes and derricks that hoist personnel must conform to the following: Be placed on a firm foundation; Be uniformly level within one percent of level grade; Have a minimum safety factor of seven for the load line (wire rope) of the crane or derrick (this means it must be capable of supporting seven times the maximum intended load); Move the personnel platform slowly and cautiously without any sudden jerking of the crane, derrick, or platform; Have rotation-resistant rope with a minimum safety factor of 10; and Have all brakes and locking devices on the crane or derrick set when the occupied personnel platform is in a stationary working position. 15

16 In addition, the combined weight of the loaded personnel platform and its rigging must not exceed 50 percent of the rated capacity of the crane or derrick for the radius and configuration of the crane or derrick. Note: The crane operator must always be at the controls when the crane engine is running and the personnel platform is occupied. The crane operator also must have full control over the movement of the personnel platform. For more information, see the construction industry requirements. Loading/unloading Proper loading is essential for all types of cranes. Never use a crane and/or its accessories to lift more than the rated load capacity. A crane s load rate capacity is based on new equipment. When rating a load to be lifted, consider the age of the crane and daily wear, both of which reduce the operating capacity of the crane. When loading or unloading with a locomotive crane, take precautions to ensure that it is not swung into a position where railway cars on an adjacent track might strike it. Be certain that cars are not being moved on the adjacent track and proper flag protection has been established prior to swinging the load. Load ratings Where stability governs lifting performance The margin of stability for determining load ratings, with booms of stipulated lengths at stipulated working radii for the various types of crane mountings, is established by taking a percentage of the loads which will produce a condition of tipping or balance with the boom in the least stable direction, relative to the mounting. The load ratings cannot exceed the following percents with the indicated types of mounting under conditions stipulated in (c)(1)(ii) and (iii): Type of crane mounting Locomotive, without outriggers: Booms 60 feet or less Maximum load ratings (percent of tipping loads) 85 1 Booms over 60 feet 85 1 Locomotive, using outriggers fully extended 80 Crawler, without outriggers 75 Crawler, using outriggers fully extended 85 Truck and wheel mounted without outriggers 85 or using outriggers fully extended 1 Unless this results in less than 30,000 pound-feet net stabilizing moment about the rail, which shall be minimum with such booms. Locomotive cranes Use the following stipulations when applying the load values for locomotive cranes: Tipping with or without the use of outriggers occurs when half of the wheels farthest from the load leave the rail. The crane must be standing on track which is level within one percent grade. Radius of the load is the horizontal distance from a projection of the axis of rotation to the rail support surface, before loading, to the center of vertical hoist line or tackle with load applied. Tipping loads from which ratings are determined must be applied under static conditions only, (i.e., without dynamic effect of hoisting, lowering, or swinging). The weight of all auxiliary handling devices such as hoist blocks, hooks, and slings must be considered a part of the load rating. 16

17 Crawler, truck, and wheel-mounted cranes Stipulations for applying the values for crawler, truck, and wheel-mounted cranes must comply with ANSI/SAE J765 Crane Load-Stability Test Code, Society of Automotive Engineers. The effectiveness of stability will also be influenced by other factors. Be sure to take the following additional factors into consideration: Freely suspended loads, Track, Wind, Ground conditions, Condition and inflation of rubber tires, Boom lengths, Proper operating speeds for existing conditions, and Careful and competent operation. Also take into account the effect of lights, pile lead adaptors, and other nonstandard attachments to the boom such as jibs and whip lines. Where structural competence governs lifting performance While some load ratings are limited by a crane s stability, other factors may also play a role in a crane s operating range. Some additional factors to consider include unstable loads that may increase tipping and loads that are nonsymmetrical. Ratings for these loads may be governed by structural competence of the equipment rather than stability. Load handling A crane s load hoist mechanism generally consists of a drum or hydraulic cylinder with the necessary rope reeving sufficient to safely lift and lower a load. When a load is in the lowest position, there must be at least two full wraps of rope remaining on the drum. All cranes have some type of braking system that will control and stop the load from falling. Always take extreme caution when operating a crane near electric power lines. Stability During work operations, brakes or other locking devices must be applied to hold the crane stationary. Rail clamps may not be used as a method for restraining tipping locomotive cranes. Never operate a crane without the full amount of any ballast or counterweight in place, as specified by the manufacturer. Exceptions to this requirement are truck cranes that have dropped the ballast or counterweight. They may be operated temporarily with special care and only for light loads without the full ballast or counterweight in place. The ballast or counterweight specified by the manufacturer may not be exceeded. Load size Do not load a crane beyond its rated load capacity. When loads which are limited by structural competence rather than by stability are to be handled, ensure that the weight of the load has been determined within plus or minus 10 percent before it is lifted. Attaching the load Never wrap the hoist rope around the load. The load must be attached to the hook by a sling or other device having adequate capacity. Holding the load Most importantly, the operator must never leave the controls when the load is lifted, nor may anyone be allowed to walk under or stand by a suspended load. 17

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